Justin Dedich attended Chaparral High School in Temecula, California. He earned a 4-star rating from both ESPN and 247sports. He chose to join USC after high school.
In his first three seasons with USC, he saw just 8 games of action. His first full season came in 2021 when he started 12 games for the Trojans, allowing just 2 QB hits and 0 sacks on the year.
Over the last two years, Dedich started all 26 games for the Trojans and was an integral part of the Trojan offensive line unit which was selected as a Joe Moore Award Semifinalist in 2022.